Saved Bookmarks
This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What percentage of solar radiation is absorbed by all the green plants for photosynthesis ?A. 0.001B. 0.01C. 0.1D. 1 |
| Answer» Correct Answer - B | |
| 2. |
What will happen if we kill all the organisms in one trophic level? |
| Answer» If we kill all the organisms of one trophic level it will create an imbalance in the ecosystem. As an Example, In a food chain Grass`rarr` Dear`rarr`Lion, If we remove all lions then population of deer will increase which will cause over-grazing. This will lead to deforestation. It may even lead to soil erosion causing further conversion of fertile land into barren desert | |
| 3. |
What will happen if deer is missing in the food chain given below ? Grass `to` Deer `to` TigerA. The population of tigers increasesB. The population of grass decreasesC. Tigers will start eating grassD. The population of tigers decreases and the population of grass increases. |
| Answer» Correct Answer - D | |
| 4. |
In a grassland ecosystem a hawk represents the ____ |
| Answer» top carnivore | |
| 5. |
Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem? |
|
Answer» (a) yes, the impact of removeing all the organisms in a trophic level will be different for different trophic levels. For example, in the food chain : Grass`to` Deer`to` Lion : (i) If we remove all the lions at the third trophic level, then the number of deer will increase too much . All these deer will eat up all the grass and other plants turning the forest into a desert. (ii) If we remove all the deer at the second trophic level, then lions will not get sufficient food, they will starve and die. Deer eat grass and other green plants, so the amount of grass and other green plants will increase too much. (b) No, all the organisms of any trophic level connot be removed wihout causing any damage to the ecosystem. |
|
| 6. |
Which of the following belong to the same trophic level? Grass, Hawk, Rabbit, Frog, Deer |
| Answer» Here, grass is a producer, hawk is a top carnivore, rabbit is a herbivore, frog is a carnivore and deer is a herbivore. Since rabbit and deer are both herbivores, so they belong to the same trophic level (2nd trophic level). | |
| 7. |
What will be the result if in the following food chain goat popualtion is decreased considerably ? Green plant ` to` goat ` to` LionA. Green plants will die.B. The population of lion will increaseC. The population of green plants will increase and the lion population ill decrease.D. Lion will start consuming green plants |
| Answer» Correct Answer - C | |
| 8. |
In the figure given alongside, the various trophic levels are shown in the form of a pyramid. At which trophic level the maximum energy is available ? A. `T_(4)`B. `T_(2)`C. `T_(1)`D. `T_(3)` |
| Answer» Correct Answer - C | |
| 9. |
Which of the following group of organisms are not constituents of a food chain ? (i) grass, lion, rabbit, wolf (ii) plankton, man, fish, grasshopper (iii) wolf, grass, snake, tiger (iv) frog, snake, eagle, grass, grasshopperA. (i) and (iii)B. (iii) and (iv)C. (ii) and (iii)D. (i) and (iv) |
| Answer» Correct Answer - C | |
| 10. |
Which of the following constitute a food-chain?A. Grass. Wheat and mangoB. Grass, goat and humenC. Grass, cow and elephantD. Grass, fish and goat |
| Answer» Correct Answer - b | |
| 11. |
The harmful chemical which is accumulating in human beings through food chain is :A. benzenehexachlorideB. dichlorodiphenyltrichloroethaneC. chlorofluorocarbonD. abscisic acid |
| Answer» Correct Answer - B | |
| 12. |
If the energy transferred to a tertiary consumer in a food chain is 10 J, how much energy was available to the primary consumer ?A. 100 JB. 500 JC. 1000 JD. 5000 J |
| Answer» Correct Answer - C | |
| 13. |
Why is straight line food chain not common in the natural ecosystem ? |
| Answer» Because many animals eat more than one kind of food | |
| 14. |
An aquatic food chain comprises of the organisms like tadpoles, weeds, fish and waterbeetles. The organism which gets the minimum energy through this food chain is :A. water beetlesB. tadpolesC. weedsD. fish |
| Answer» Correct Answer - D | |
| 15. |
In addition to wheat plants, a crop field ecosystem has organisms such as snake, peacock, eagle and mice. If the weat plants are sprayed with pesticides periodically, which of the following will have the minimum concentration of pesticides in the body ?A. snakeB. eagleC. miceD. peacock |
| Answer» Correct Answer - C | |
| 16. |
Flow of energy in an ecosystem is alwaysA. unidirectionalB. bidirectionalC. cyclicD. multidirectional |
| Answer» Correct Answer - A | |
| 17. |
Which of the following gets the minimum energy through the food chain in an ecosystem?A. carnivoreB. large carnivoreC. producerD. herbivore |
| Answer» Correct Answer - B | |
| 18. |
The ultimate source of energy in an ecosystem is the___ |
| Answer» Correct Answer - sun | |
| 19. |
Give one example each of herbivore, carnivore and omnivore. |
| Answer» Rabbits are herbivores, tigers are carnivores and human beings are omnivores | |
| 20. |
Substance that are broken down by biologial process are called___ |
| Answer» biodegradable | |
| 21. |
Why do herbivoures occupy a position next to producers in a food chain ? |
| Answer» Because herbivores eat only plants, i.e, produces | |
| 22. |
Give a scientific term for each of the following : (a) The component which includes physical environment, nutrients and climatic factors (b) The physical and biological world where the organisms live (c ) Organisms which eat both plants and flesh of other animals. (d) A position in a food chain (e) Accumulation of chemicals at sucessive trophic levels of a food chain (f) Organisms which obtain food from other living organisms |
| Answer» (a) Abiotic component (b) Ecosystem (c ) Omnivores (d) Trophic level ( e) Biomagnification (f) Carnivours | |
| 23. |
The use of one of the following will pollute the environment. This one is :A. paper carry bagsB. cotton cloth carry bagsC. nylon cloth carry bagsD. jute carry bags |
| Answer» Correct Answer - C | |
| 24. |
Which of the following cannot be added in a composting pit to prepare compost ?A. sunflower plantsB. fruit and vegetable peelsC. flowers of plasticD. red worms |
| Answer» Correct Answer - C | |
| 25. |
Which trophic level is occupied by carnivores in a food chain ?A. FirstB. SecondC. ThirdD. Fourth |
| Answer» Correct Answer - C | |
| 26. |
Choose the correct statement (s)A. Green plants convert solar energy into chemical energy.B. Substances that are broken down by biological processes are nonbiodegradable.C. DDT and plastic are nonbiodegradable.D. producers synthesize food from inorganic compounds |
| Answer» Correct Answer - A::C::D | |
| 27. |
Chlorofluorocarbon (CFC) is mainly responsible for:A. global warmingB. acid rainC. biomagnificationD. ozone - layer depletion |
| Answer» Correct Answer - D | |
| 28. |
Which of the following effects on humans will be caused by excessive exposure to UV-rays ?A. Skin cancerB. Damage to immune systemC. Damage to heart and lungsD. peptic ulcers |
| Answer» Correct Answer - A::B | |
| 29. |
The herbrivores are notA. ConsumersB. decomposesC. producersD. autotrophs |
| Answer» Correct Answer - B::C::D | |
| 30. |
Bacteria and fungi do not act asA. producersB. ConsumersC. autotrophsD. decomposers |
| Answer» Correct Answer - A::B::C | |
| 31. |
Omnivores are one type ofA. ProducersB. ConsumersC. decomposersD. abiotic component |
| Answer» Correct Answer - B | |
| 32. |
What are the problems caused by the non-biodegradable wastes that we generate? |
|
Answer» The non-biodegradable wastes connot be made less toxic easily, so they cause a lot of problems for us as well as the environment. For example : (i) Some of the non-biodegradable wastes (such as pesticides like DDT and metals like mercury) enter the food chain of humens. These non-biodegradable wastes get concentrated in humen beings and damage their health in the long run. (ii) The excessive use of non-biodegradable fertillisers in agriculture makes the soil either too much acidic or too much alkaline, When the soil becomes too acidic or too alkaline, the crop yields is reduced. |
|
| 33. |
If all the waste we generate is biodegradable, will this have no impact on the environment? |
| Answer» If all the waste generated would be biodegradable this will also create problem. As the numbers of decomposers will be quite low so wastes cannot be broken down into harmless simpler substance at right time. It will became breeding ground for flies causing spread of diseases. It will also emits foul smell which makes the life of people miserable | |
| 34. |
Why are some substances biodegradable and some non-biodegradable? |
| Answer» Substances are classified as biodegradable and non-biodegradable because some substances can be decomposed by microorganisms and some cannot. Substances that are broken down into simple soluble forms are called biodegradable substances and the substances that are not decomposed by microorganisms into harmless substances are called non biodegradable substances. | |
| 35. |
Give any two ways in which non-biodegradable substances would affect the environment |
|
Answer» Non-biodegradeable substances affect the envioronment by: `rarr` They contaminate soil and water resources as theycannot be decomposed by microorganisms. `rarr` These substances, when accidently eaten by stray animals, can harm them and can even cause their death. |
|
| 36. |
Give any two ways in which biodegradable substances would affect the environment |
|
Answer» Biodegradable substances affect the environment by: `rarr` The biodegradable substances such as tree leaves, plant parts, and kitchen wastes can be usedas humus after composting This will enhance the soil fertility `rarr` The biodegradable substances mainly contain carbon. These substances after decompositionrelease that carbon back into the atmosphere. |
|
| 37. |
The substances formed in decomposition are released into the ____ and the ____ |
| Answer» soil, atmosphere | |
| 38. |
Human activites have an impact on the ____ |
| Answer» Correct Answer - environment | |
| 39. |
A network of interconnected food chains is calledA. ecological pyramidB. food webC. ecosystemD. trophic level |
| Answer» Correct Answer - B::C::D | |
| 40. |
If 10 kilocalories of energy is available to snakes (fourth trophic level), what be the available energy at producer, level in the following food chain? Grass `to` Grasshopper ` to` Frog` to` SnakeA. 100 kilocaloriesB. 1000 kilocaloriesC. 1 kilocaloryD. 10,000 kilocalories |
| Answer» Correct Answer - D | |
| 41. |
In a food chain, the initial organism is usually :A. PhotosyntheticB. herbivoreC. saprophyticD. parasitic |
| Answer» Correct Answer - A | |
| 42. |
Which of the following constitutes a food chain ?A. Grass, Wheat and MangoB. Grass, Goat and HumanC. Goat, Cow and ElephantD. Grass, Fish and Goat |
| Answer» Correct Answer - B | |
| 43. |
What provides the energy which then flows through a food chain ?A. glucoseB. oxygenC. respirationD. sunlight |
| Answer» Correct Answer - D | |
| 44. |
Sahara Desert was formed over a period of time due to one of the following uncontrolled activities of man :A. excessive cutting down of forest plants and treesB. excessive killing of large herbivoresC. excessive killing of large carnivoresD. excessive use of poisonous chemicals called herbicidcs |
| Answer» Correct Answer - C | |
| 45. |
What happens in biological magnification?A. There is progressive increase in the level of harmful substances through trophic levels.B. There is a progressive increase in the body weight through trophic levels.C. There is a progressive increase in the number of organisms through trophic levelsD. There is progressive increase in biological activities through trophic levels |
|
Answer» Correct Answer - A |
|
| 46. |
Do microorganisms like bacteria play any role in an ecosystem ? |
| Answer» Microorganisms act as decomposers in an ecosytem . | |
| 47. |
Why do only autotrophs capture the energy present in the sunlight ? |
| Answer» Because autotrophs have chlorophyll that absorb solar energy | |
| 48. |
Disposable plastic plates should not be used because :A. they are made of light weight materialsB. they are made of toxic materialsC. they are made of biodegradable materialsD. they are made of non-biodegradable materials |
| Answer» Correct Answer - D | |
| 49. |
Why shold we not use plastic cups and plates ?A. Because they are costlyB. Because they are biodegradableC. Because the are very lightD. Because they are nonbiodegradable |
| Answer» Correct Answer - C | |
| 50. |
Which of the following contain only nonbiodegradable things?A. Leaves,wood, plasticsB. Polythene, aluminium can, mercuryC. DDT, cow dung, fruit peelsD. Kitchen waste, sewage, pen |
|
Answer» Correct Answer - B |
|